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a9:0 KLEINFELDER <br />' 2 GROUNDWATER MONITORING <br /> Quarterly groundwater monitoring was performed under the direction of the September <br /> 24, 2004 SJCEHD letter approving the recommendations in the PSC June 2004 Site <br /> Investigation Report PSC and subcontractor Kleinfelder performed the groundwater <br /> monitoring on January 31 and February 01, 2005 The data are presented in the <br /> following sections Tables for groundwater elevations, well depths, and analytical <br /> results are included as attached Tables Contour maps for groundwater elevations, <br /> benzene concentrations, and TPH-G concentrations are included as attached Figures <br /> Field data forms are Included in Appendix A Laboratory analytical reports are included <br /> In Appendix B <br /> 21 GROUNDWATER MONITORING PROCEDURES <br /> Groundwater elevations and total depth measurements were obtained from 13 <br /> monitoring wells (MW)s (MW-1 through MW---13), two sparging wells (SP-1 through SP- <br /> 2), and two piezometers (PZ-1 and PZ-2) The vent well (VW-1) was not measured <br /> Well depths, groundwater levels, and the potential presence of free-phase gasoline <br />' product were measured in each well prior to sampling utilizing an electronic oil/water <br /> interface probe and/or electronic water level indicator In addition, prior to purging the <br /> wells, the first bailer of purge water was visually observed for free product <br /> Groundwater samples were collected and submitted for analysis from the following <br /> locations MWA, MW-5, MW-7, MW-8, MWA 0, MWA 1, MWA 2, SPA, SP-2, SP-3, SP- <br /> 4, SP-5, SP-6, PZ-1, and PZ-2 <br /> Prior to sample collection, the wells were purged a minimum of three-well-casing <br /> volumes with a dedicated bailer to collect a representative sample The purged water <br /> was monitored for stability via the field parameters of pH, conductivity, temperature, and <br /> the visual observation of water clarity The purged water was stored in 55-gallon drums <br /> and the drums were transported to PSC's licensed waste disposal facility <br /> Upon purging the appropriate volume of groundwater, sample aliquots were retrieved <br /> and placed in laboratory provided containers The containers were properly labeled and <br /> C23-484517-BOO/SAC5R608 Page 6 of 11 September 14, 2005 <br /> Copyright 2005 Klemfelder, Inc <br />